When coming out of apic mode attempt to set the appropriateapic back into virtual wire mode. This improves on previous versionsof this patch by by never setting bot the local apic and the ioapicinto veritual wire mode.

This code looks at data from the mptable to see if an ioapic hasan ExtInt input to make this decision. A future improvementis to figure out which apic or ioapic was in virtual wire modeat boot time and to remember it. That is potentially a more accuratemethod, of selecting which apic to place in virutal wire mode.